61555259 has 2 divisors, whose sum is σ = 61555260. Its totient is φ = 61555258.

The previous prime is 61555253. The next prime is 61555261. The reversal of 61555259 is 95255516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61555259 - 2¹⁶ = 61489723 is a prime.

Together with 61555261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61555253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777629 + 30777630.

It is an arithmetic number, because the mean of its divisors is an integer number (30777630).

Almost surely, 2^61555259 is an apocalyptic number.

61555259 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555259 is an equidigital number, since it uses as much as digits as its factorization.

61555259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67500, while the sum is 38.

The square root of 61555259 is about 7845.7159647798. The cubic root of 61555259 is about 394.8405252725.

The spelling of 61555259 in words is "sixty-one million, five hundred fifty-five thousand, two hundred fifty-nine".